PostPlaza is free to use for users. This means that anybody with an empty wallet can fully use the website. They can post, sell their posts, like, repost, etc.
PostPlaza pays for all the gas costs so users can use the website seamlessly. This is done with an array of relays. These are addresses that pick up signed transactions and submit them to the blockchain. Transactions are signed by the user and sent to a queue to be submitted.
Signatures are created by the user or the user’s Approved Address using EIP-712. Each contract has functions that include optional r, s, and v parameters. The v parameter should be set to 0 for manual transactions where a signature isn’t being used.